P Xia

Summary

Affiliation: University of California
Country: USA

Publications

  1. ncbi request reprint A dosimetric comparison of fan-beam intensity modulated radiotherapy with Gamma Knife stereotactic radiosurgery for treating intermediate intracranial lesions
    L Ma
    Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore 21201, USA
    Int J Radiat Oncol Biol Phys 45:1325-30. 1999
  2. ncbi request reprint The effect of beam energy and number of fields on photon-based IMRT for deep-seated targets
    Andrea Pirzkall
    Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA 94143 0226, USA
    Int J Radiat Oncol Biol Phys 53:434-42. 2002
  3. ncbi request reprint A leaf sequencing algorithm to enlarge treatment field length in IMRT
    Ping Xia
    The Department of Radiation Oncology, University of California at San Francisco, Comprehensive Cancer Center, 94143 1708, USA
    Med Phys 29:991-8. 2002
  4. ncbi request reprint Carcinomas of the paranasal sinuses and nasal cavity treated with radiotherapy at a single institution over five decades: are we making improvement?
    Allen M Chen
    Department of Radiation Oncology, University of California, San Francisco UCSF Comprehensive Cancer Center, San Francisco, CA, USA
    Int J Radiat Oncol Biol Phys 69:141-7. 2007
  5. ncbi request reprint Multileaf collimator leaf sequencing algorithm for intensity modulated beams with multiple static segments
    P Xia
    Department of Radiation Oncology, University of California at San Francisco 94143, USA
    Med Phys 25:1424-34. 1998
  6. ncbi request reprint A study of planning dose constraints for treatment of nasopharyngeal carcinoma using a commercial inverse treatment planning system
    Ping Xia
    Department of Radiation Oncology, University of California, San Francisco, 94143 1708, USA
    Int J Radiat Oncol Biol Phys 59:886-96. 2004
  7. ncbi request reprint Communication and sampling rate limitations in IMRT delivery with a dynamic multileaf collimator system
    Ping Xia
    The Department of Radiation Oncology, University of California at San Francisco, 94143, USA
    Med Phys 29:412-23. 2002
  8. ncbi request reprint Comparison of treatment plans involving intensity-modulated radiotherapy for nasopharyngeal carcinoma
    P Xia
    Department of Radiation Oncology, University of California at San Francisco, San Francisco, CA 94143, USA
    Int J Radiat Oncol Biol Phys 48:329-37. 2000
  9. doi request reprint A feasibility study of using conventional jaws to deliver complex IMRT plans for head and neck cancer
    G Mu
    Department of Radiation Oncology, University of California, San Francisco, CA 94143 1708 USA Comprehensive Cancer Center, 1600 Divisadero Street, Suite H1031, San Francisco, CA 94143 1708 USA
    Phys Med Biol 54:5613-23. 2009
  10. doi request reprint Comparison of IMRT planning with two-step and one-step optimization: a way to simplify IMRT
    E Ludlum
    Department of Radiation Oncology, University of California, San Francisco, CA, USA Department of Nuclear Engineering, University of California, Berkeley, CA, USA
    Phys Med Biol 53:807-21. 2008

Collaborators

Detail Information

Publications48

  1. ncbi request reprint A dosimetric comparison of fan-beam intensity modulated radiotherapy with Gamma Knife stereotactic radiosurgery for treating intermediate intracranial lesions
    L Ma
    Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore 21201, USA
    Int J Radiat Oncol Biol Phys 45:1325-30. 1999
    ..To compare and evaluate treatment plans for the fan-beam intensity modulated radiotherapy and the Gamma Knife radiosurgery for treating medium-size intracranial lesions (range 4-25 cm3)...
  2. ncbi request reprint The effect of beam energy and number of fields on photon-based IMRT for deep-seated targets
    Andrea Pirzkall
    Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA 94143 0226, USA
    Int J Radiat Oncol Biol Phys 53:434-42. 2002
    ..To examine the influence of energy and number of beams on nontarget dose when using intensity-modulated radiation therapy (IMRT) to treat deep-seated targets...
  3. ncbi request reprint A leaf sequencing algorithm to enlarge treatment field length in IMRT
    Ping Xia
    The Department of Radiation Oncology, University of California at San Francisco, Comprehensive Cancer Center, 94143 1708, USA
    Med Phys 29:991-8. 2002
    ..Using a single isocenter, the new algorithm provides a solution to extend the usable IMRT field length from 21 to 27 cm for IMRT on a commercial linear accelerator using the step and shoot delivery method...
  4. ncbi request reprint Carcinomas of the paranasal sinuses and nasal cavity treated with radiotherapy at a single institution over five decades: are we making improvement?
    Allen M Chen
    Department of Radiation Oncology, University of California, San Francisco UCSF Comprehensive Cancer Center, San Francisco, CA, USA
    Int J Radiat Oncol Biol Phys 69:141-7. 2007
    ..To compare clinical outcomes of patients with carcinomas of the paranasal sinuses and nasal cavity according to decade of radiation treatment...
  5. ncbi request reprint Multileaf collimator leaf sequencing algorithm for intensity modulated beams with multiple static segments
    P Xia
    Department of Radiation Oncology, University of California at San Francisco 94143, USA
    Med Phys 25:1424-34. 1998
    ..For MLC systems with interleaf motion constraint, we prove mathematically that this constraint reduces the tongue and groove effect at the expense of an increase of 25% in the number of segments...
  6. ncbi request reprint A study of planning dose constraints for treatment of nasopharyngeal carcinoma using a commercial inverse treatment planning system
    Ping Xia
    Department of Radiation Oncology, University of California, San Francisco, 94143 1708, USA
    Int J Radiat Oncol Biol Phys 59:886-96. 2004
    ..The purpose of this study was to develop and test planning dose constraint templates for tumor and normal structures in the treatment of nasopharyngeal carcinoma (NPC) using a specific commercial inverse treatment planning system...
  7. ncbi request reprint Communication and sampling rate limitations in IMRT delivery with a dynamic multileaf collimator system
    Ping Xia
    The Department of Radiation Oncology, University of California at San Francisco, 94143, USA
    Med Phys 29:412-23. 2002
    ..Finally, clinical significance is discussed...
  8. ncbi request reprint Comparison of treatment plans involving intensity-modulated radiotherapy for nasopharyngeal carcinoma
    P Xia
    Department of Radiation Oncology, University of California at San Francisco, San Francisco, CA 94143, USA
    Int J Radiat Oncol Biol Phys 48:329-37. 2000
    ..To compare intensity-modulated radiotherapy (IMRT) treatment plans with conventional treatment plans for a case of locally advanced nasopharyngeal carcinoma...
  9. doi request reprint A feasibility study of using conventional jaws to deliver complex IMRT plans for head and neck cancer
    G Mu
    Department of Radiation Oncology, University of California, San Francisco, CA 94143 1708 USA Comprehensive Cancer Center, 1600 Divisadero Street, Suite H1031, San Francisco, CA 94143 1708 USA
    Phys Med Biol 54:5613-23. 2009
    ..In conclusion, conventional jaws can be used solely to deliver complex IMRT plans for patients with nasopharyngeal cancer yet still within a practical delivery time...
  10. doi request reprint Comparison of IMRT planning with two-step and one-step optimization: a way to simplify IMRT
    E Ludlum
    Department of Radiation Oncology, University of California, San Francisco, CA, USA Department of Nuclear Engineering, University of California, Berkeley, CA, USA
    Phys Med Biol 53:807-21. 2008
    ..One-step optimization is an effective method for simplifying IMRT plans, resulting in a significant reduction in the number of segments for step and shoot delivery without significantly sacrificing plan quality...
  11. ncbi request reprint Toxicity following high-dose three-dimensional conformal and intensity-modulated radiation therapy for clinically localized prostate cancer
    H K Shu
    Department of Radiation Oncology, University of California, San Francisco, California, USA
    Urology 57:102-7. 2001
    ..CONCLUSIONS: Doses of 82 Gy or more to a portion of the prostate gland can be tolerated with acceptable morbidity. This observation supports the continued investigation of IMRT as a means for improving disease control in prostate cancer...
  12. ncbi request reprint Delivery systems of intensity-modulated radiotherapy using conventional multileaf collimators
    P Xia
    Department of Radiation Oncology, University of California at San Francisco, USA
    Med Dosim 26:169-77. 2001
    ..Machine-related and patient plan-related quality assurance issues are discussed. Our conclusions are that MLC-based IMRT delivery is practical; however, extensive efforts are needed when IMRT is implemented in clinics...
  13. ncbi request reprint Forward or inversely planned segmental multileaf collimator IMRT and sequential tomotherapy to treat multiple dominant intraprostatic lesions of prostate cancer to 90 Gy
    P Xia
    Department of Radiation Oncology, University of California at San Francisco, San Francisco, CA 94143, USA
    Int J Radiat Oncol Biol Phys 51:244-54. 2001
    ..6 Gy, while keeping the doses to the rectum and the bladder significantly lower than those associated with a Grade 2 complication rate of 10%...
  14. doi request reprint Computer-Assisted, Atlas-Based Segmentation for Target Volume Delineation in Whole Pelvic IMRT for Prostate Cancer
    S Pejavar
    Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA, USA
    Technol Cancer Res Treat 12:199-206. 2013
    ..Despite significant inter-physician differences, atlas-based segmentation for pelvic lymph node delineation serves as an initial guideline for physicians, potentially improving both consistency and efficiency in contouring...
  15. doi request reprint Impact of MLC leaf position errors on simple and complex IMRT plans for head and neck cancer
    G Mu
    Department of Radiation Oncology, University of California, San Francisco, CA, USA
    Phys Med Biol 53:77-88. 2008
    ..The average changes in parotid glands were 9% in simple plans versus 13% for the complex plans. Overall, simple IMRT plans are less sensitive to leaf position errors than complex IMRT plans...
  16. ncbi request reprint New technologies in the radiotherapy clinic
    J L Meyer
    Department of Radiation Oncology, Saint Francis Memorial Hospital, San Francisco, CA 94109, USA
    Front Radiat Ther Oncol 40:1-17. 2007
    ....
  17. ncbi request reprint Dose calculation using megavoltage cone-beam CT
    Olivier Morin
    Comprehensive Cancer Center, Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA 94143, USA
    Int J Radiat Oncol Biol Phys 67:1201-10. 2007
    ..To demonstrate the feasibility of performing dose calculation on megavoltage cone-beam CT (MVCBCT) of head-and-neck patients in order to track the dosimetric errors produced by anatomic changes...
  18. ncbi request reprint A feasibility study of using conventional jaws to deliver IMRT plans in the treatment of prostate cancer
    Yongbok Kim
    Department of Radiation Oncology, University of California, San Francisco, Comprehensive Cancer Center, 1600 Divisadero Street, Suite H1031, San Francisco, CA 94143 1708, USA
    Phys Med Biol 52:2147-56. 2007
    ..61 +/- 0.07, 0.73 +/- 0.05 and 0.83 +/- 0.05, respectively. In conclusion, inverse IMRT plans using conventional jaws are clinically feasible, achieving better plan quality than 3D-CRT plans...
  19. ncbi request reprint Patient dose considerations for routine megavoltage cone-beam CT imaging
    Olivier Morin
    Comprehensive Cancer Center Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143, USA
    Med Phys 34:1819-27. 2007
    ..Reducing the imaging volume in the cranio-caudal direction can further reduce the dose delivered for MVCBCT. This is a useful feature to eliminate the imaging dose to the eyes or to focus on a specific region of interest for alignment...
  20. ncbi request reprint Detection of treatment setup errors between two CT scans for patients with head and neck cancer
    Leah C Ezzell
    Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143 1708, USA
    Med Phys 34:3233-42. 2007
    ....
  21. ncbi request reprint A treatment planning analysis of inverse-planned and forward-planned intensity-modulated radiation therapy in nasopharyngeal carcinoma
    Ian Poon
    Department of Radiation Oncology, Toronto Sunnybrook Regional Cancer Centre, University of Toronto, Toronto, Ontario, Canada
    Int J Radiat Oncol Biol Phys 69:1625-33. 2007
    ..To compare dose-volume histograms of target volumes and organs at risk in 57 patients with nasopharyngeal carcinoma (NPC) with inverse- (IP) or forward-planned (FP) intensity-modulated radiation treatment (IMRT)...
  22. ncbi request reprint A self consistent normalized calibration protocol for three dimensional magnetic resonance gel dosimetry
    Richard L Cardenas
    Department of Physics, Texas Tech University, Lubbock, TX 79409 1051, USA
    Magn Reson Imaging 20:667-79. 2002
    ....
  23. ncbi request reprint An algorithm for shifting MLC shapes to adjust for daily prostate movement during concurrent treatment with pelvic lymph nodes
    Erica Ludlum
    Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143, USA
    Med Phys 34:4750-6. 2007
    ..0 cm. In order to concurrently treat the prostate and pelvic lymph nodes with the prostate moving independently, shifting selected MLC leaf pairs may be a more practical adaptive solution than shifting the patient...
  24. ncbi request reprint Low-dose megavoltage cone-beam CT for radiation therapy
    Jean Pouliot
    Department of Radiation Oncology, University of California San Francisco, CA 94143 1708, USA
    Int J Radiat Oncol Biol Phys 61:552-60. 2005
    ....
  25. doi request reprint Can all centers plan intensity-modulated radiotherapy (IMRT) effectively? An external audit of dosimetric comparisons between three-dimensional conformal radiotherapy and IMRT for adjuvant chemoradiation for gastric cancer
    Hans T Chung
    Department of Radiation Oncology, The Cancer Institute, National University Hospital, Singapore
    Int J Radiat Oncol Biol Phys 71:1167-74. 2008
    ..To compare dosimetric endpoints between three-dimensional conformal radiotherapy (3D-CRT) and intensity-modulated radiotherapy (IMRT) at our center with limited IMRT experience, and to perform an external audit of the IMRT plans...
  26. doi request reprint Proposed rectal dose constraints for patients undergoing definitive whole pelvic radiotherapy for clinically localized prostate cancer
    Linda W Chan
    Department of Radiation Oncology, University of California, San Francisco, School of Medicine, San Francisco, CA 94115, USA
    Int J Radiat Oncol Biol Phys 72:69-77. 2008
    ..The purpose of this study was to develop these constraints, demonstrate that they are achievable, and assess the corresponding rectal toxicity...
  27. doi request reprint Intensity-modulated chemoradiation for treatment of stage III and IV oropharyngeal carcinoma: the University of California-San Francisco experience
    Kim Huang
    Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143 0226, USA
    Cancer 113:497-507. 2008
    ..Treatment outcomes for stage III and IV oropharyngeal carcinoma treated with intensity-modulated radiotherapy (IMRT) and concurrent chemotherapy without prior surgical resection were reviewed...
  28. ncbi request reprint Simulated real time image guided intrafraction tracking-delivery for hypofractionated prostate IMRT
    Sabbir Hossain
    Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143 1708, USA
    Med Phys 35:4041-8. 2008
    ....
  29. ncbi request reprint Intensity-modulated radiotherapy in the treatment of nasopharyngeal carcinoma: an update of the UCSF experience
    Nancy Lee
    Department of Radiation Oncology, University of California San Francisco, 505 Parnassus Avenue, L 08, San Francisco, CA 94143, USA
    Int J Radiat Oncol Biol Phys 53:12-22. 2002
    ..To update our experience with intensity-modulated radiotherapy (IMRT) in the treatment of nasopharyngeal carcinoma (NPC)...
  30. ncbi request reprint Intensity-modulated radiation therapy for malignancies of the nasal cavity and paranasal sinuses
    Megan E Daly
    Department of Radiation Oncology, University of California, San Francisco UCSF Comprehensive Cancer Center, San Francisco, CA, USA
    Int J Radiat Oncol Biol Phys 67:151-7. 2007
    ..To report the clinical outcome of patients treated with intensity-modulated radiation therapy (IMRT) for malignancies of the nasal cavity and paranasal sinuses...
  31. ncbi request reprint Intensity-modulated radiotherapy improves lymph node coverage and dose to critical structures compared with three-dimensional conformal radiation therapy in clinically localized prostate cancer
    Alice Wang-Chesebro
    Department of Radiation Oncology, University of California San Francisco, San Francisco, CA 94115, USA
    Int J Radiat Oncol Biol Phys 66:654-62. 2006
    ....
  32. ncbi request reprint Simplifying intensity-modulated radiotherapy plans with fewer beam angles for the treatment of oropharyngeal carcinoma
    Robert Takamiya
    Department of Radiation Oncology, University of California San Francisco, San Francisco, California, USA
    J Appl Clin Med Phys 8:26-36. 2007
    ..However, the improved efficiency does not significantly reduce the total number of MUs nor the indirect radiation dose...
  33. ncbi request reprint Comparison of treatment plans using intensity-modulated radiotherapy and three-dimensional conformal radiotherapy for paranasal sinus carcinoma
    David Huang
    Department of Radiation Oncology, University of California San Francisco, San Francisco, CA, USA
    Int J Radiat Oncol Biol Phys 56:158-68. 2003
    ..To compare intensity-modulated radiotherapy (IMRT) treatment planning with three-dimensional conformal radiotherapy (3D-CRT) planning for paranasal sinus carcinoma...
  34. ncbi request reprint Intensity-modulated radiation therapy for head-and-neck cancer: the UCSF experience focusing on target volume delineation
    Nancy Lee
    Department of Department of Radiation Oncology, University of California San Francisco, San Francisco, CA, USA
    Int J Radiat Oncol Biol Phys 57:49-60. 2003
    ....
  35. ncbi request reprint Guidance document on delivery, treatment planning, and clinical implementation of IMRT: report of the IMRT Subcommittee of the AAPM Radiation Therapy Committee
    Gary A Ezzell
    Mayo Clinic, Scottsdale, Arizona 85259, USA
    Med Phys 30:2089-115. 2003
    ..This report, while not prescribing specific procedures, provides the framework and guidance to allow clinical radiation oncology physicists to make judicious decisions in implementing a safe and efficient IMRT program in their clinics...
  36. ncbi request reprint Implementing IMRT in clinical practice: a joint document of the American Society for Therapeutic Radiology and Oncology and the American Association of Physicists in Medicine
    James M Galvin
    American Association of Physicists in Medicine IMRT Subcommittee of the Radiation Therapy Committee, USA
    Int J Radiat Oncol Biol Phys 58:1616-34. 2004
  37. ncbi request reprint Managing nasopharyngeal carcinoma with intracavitary brachytherapy: one institution's 45-year experience
    Nancy Lee
    Department of Radiation Oncology, University of California San Francisco, San Francisco, CA 94143, USA
    Brachytherapy 1:74-82. 2002
    ..The local control, distant metastasis-free rate, overall survival, and morbidity are presented...
  38. ncbi request reprint A forward-planned treatment technique using multisegments in the treatment of head-and-neck cancer
    Nancy Lee
    Department of Radiation Oncology, University of California San Francisco Medical Center, San Francisco, CA, USA
    Int J Radiat Oncol Biol Phys 59:584-94. 2004
    ....
  39. ncbi request reprint Investigation of the use of MOSFET for clinical IMRT dosimetric verification
    Cynthia F Chuang
    Department of Radiation Oncology, University of California at San Francisco, Comprehensive Cancer Center, 94143, USA
    Med Phys 29:1109-15. 2002
    ..In conclusion, MOSFET detectors are suitable for routine IMRT dose verification...
  40. ncbi request reprint A new smoothing procedure to reduce delivery segments for static MLC-based IMRT planning
    Xuepeng Sun
    Department of Radiation Oncology, University of California, San Francisco, San Francisco, California 94143 1708, USA
    Med Phys 31:1158-65. 2004
    ..On the other hand, the segment numbers or delivery times are reduced by 40%, 20%, and 20% for the three cases, respectively...
  41. ncbi request reprint Effects of the intensity levels and beam map resolutions on static IMRT plans
    Xuepeng Sun
    Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143 0226, USA
    Med Phys 31:2402-11. 2004
    ..Biol., Phys. 45, 1315-1324 (1999)]. It indicates that to further improve the plan quality with the minimal cost of extra delivery time, the most economical way is to improve the resolution rather than using higher intensity levels...
  42. ncbi request reprint Investigation of using a power function as a cost function in inverse planning optimization
    Ping Xia
    Department of Radiation Oncology, University of California San Francisco, San Francisco, California 94143 1708, USA
    Med Phys 32:920-7. 2005
    ..In conclusion, using a power function with exponent greater than 2 as a cost function can effectively achieve homogeneous dose inside the target and/or minimize maximum dose to the critical structures...
  43. ncbi request reprint Method to account for dose fractionation in analysis of IMRT plans: modified equivalent uniform dose
    Clinton S Park
    Department of Radiation Oncology, University of California, San Francisco, School of Medicine, San Francisco, CA 94143 7108, USA
    Int J Radiat Oncol Biol Phys 62:925-32. 2005
    ....
  44. ncbi request reprint Repeat CT imaging and replanning during the course of IMRT for head-and-neck cancer
    Eric K Hansen
    Department of Radiation Oncology, University of California, San Francisco, San Francisco, CA 94143 1708, USA
    Int J Radiat Oncol Biol Phys 64:355-62. 2006
    ..We conducted this retrospective study to determine the dosimetric effects of repeat computed tomography (CT) imaging and replanning during the course of intensity-modulated radiotherapy (IMRT) on both normal tissues and target volumes...
  45. ncbi request reprint A population-based atlas and clinical target volume for the head-and-neck lymph nodes
    Ian Poon
    Department of Radiation Medicine, Toronto Sunnybrook Cancer Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    Int J Radiat Oncol Biol Phys 59:1301-11. 2004
    ..To develop a population-based three-dimensional lymph node target volume of the head and neck...
  46. ncbi request reprint Skin toxicity due to intensity-modulated radiotherapy for head-and-neck carcinoma
    Nancy Lee
    Department of Radiation Oncology, Medical Center, University of California San Francisco, 505 Parnassus Avenue, San Francisco, CA 94143, USA
    Int J Radiat Oncol Biol Phys 53:630-7. 2002
    ..To investigate the cause of acute skin toxicity observed in the treatment of head-and-neck cancer with extended-field intensity-modulated radiotherapy (EF-IMRT)...
  47. ncbi request reprint Comparison of intensity-modulated radiosurgery with gamma knife radiosurgery for challenging skull base lesions
    Jean L Nakamura
    Department of Radiation Oncology, University of California, San Francisco, School of Medicine, San Francisco, CA 94143, USA
    Int J Radiat Oncol Biol Phys 55:99-109. 2003
    ..To quantitatively compare intensity-modulated radiosurgery (IMRS) using 3-mm mini-multileaf collimation with gamma knife radiosurgery (GKRS) plans for irregularly shaped skull base lesions in direct proximity to organs at risk (OAR)...
  48. ncbi request reprint Image-guided radiotherapy using megavoltage cone-beam computed tomography for treatment of paraspinous tumors in the presence of orthopedic hardware
    Eric K Hansen
    Department of Radiation Oncology, University of California San Francisco, San Francisco, CA 94115, USA
    Int J Radiat Oncol Biol Phys 66:323-6. 2006
    ..This report describes a new image-guided radiotherapy (IGRT) technique using megavoltage cone-beam computed tomography (MV-CBCT) to treat paraspinous tumors in the presence of orthopedic hardware...